CN1831231A - Sewing machine - Google Patents

Abstract

The sewing machine capable of optimizing the vertical action frequency of the middle pressing foot includes one vertical actuating mechanism for the needle to move up and down, one locating mechanism for locating the sewn fabric and the needle, one middle cloth holding mechanism to make the middle pressing foot move up and down while maintaining the sewn fabric without being lifted together with the needle, and one middle pressing foot height regulating mechanism provided with driving source for regulating the height of the middle pressing foot and fitted with one action controlling mechanism for regulating the vertical amplitude of the middle pressing foot.

Description

Sewing machine

Technical Field

The invention relates to a sewing machine capable of controlling up-and-down motion of a cloth pressing mechanism.

Background

In a conventional sewing machine, a middle presser mechanism is provided for pressing down the periphery of a needle penetration portion of cloth when a needle is lifted in order to prevent the cloth from being lifted together with the needle due to friction with the needle while holding the cloth by a frame-shaped presser plate and conveying the cloth in XY directions and performing needle transfer and sewing at an arbitrary position.

In this intermediate-pressure cloth mechanism, normally, when the needle is lifted from the cloth, the cloth is pushed downward by the intermediate presser foot being pushed downward by the elastic force, and after the needle is completely lifted from the cloth, the intermediate presser foot is lifted together with the needle.

As such a middle presser mechanism, a mechanism is known in which the height of the middle presser from the needle plate can be adjusted by displacing a swing fulcrum of a swing body that vertically moves the middle presser (for example, see patent document 1).

Patent document 1: japanese unexamined patent publication Hei 7-178272

However, in the case of patent document 1, although the bottom dead center height of the vertical movement of the middle presser foot can be adjusted, the vertical movement amplitude cannot be changed. Therefore, there is the following inconvenience: the thickness of a material such as a cloth to be sewn cannot be sufficiently satisfied, and the material having a contractibility cannot be sufficiently satisfied.

Disclosure of Invention

The invention aims to change the bottom dead center height or the top dead center height of a middle presser foot, so that the middle presser foot can correspond to various sewed objects and improve the sewing quality.

The invention also aims to adjust the vertical motion amplitude of the middle presser foot, so that the middle presser foot can be reliably pressed according to the thickness or the elasticity of the sewed object, and the sewing quality is improved.

Also, the present invention aims to improve sewing efficiency.

The sewing machine of the first aspect, comprising: a needle up-down movement mechanism for moving the needle up and down; and a cloth holding mechanism which holds the sewed object and moves in the horizontal direction in a mode of positioning relative to the machine needle; a middle presser foot mechanism having a middle presser foot which is vertically movable in conjunction with the needle and presses the material to be sewn downward in the vicinity of the needle while contacting the material to be sewn; and a middle presser foot height adjusting mechanism for adjusting the height of the middle presser foot of the middle cloth pressing mechanism; wherein,

the middle presser height adjusting mechanism is provided with a driving component for adjusting the height of the middle presser,

and an operation control mechanism which controls the driving component and drives the middle presser foot to adjust the vertical movement amplitude of the middle presser foot when the middle presser foot ascends and descends respectively.

The sewing machine according to the second aspect has the structure: the cloth presser further includes a storage means for storing sewing pattern data including stitch data and storing, as a part of the sewing pattern data, center presser amplitude adjustment data related to amplitude adjustment of a center presser of the center presser, together with the stitch data; the action control mechanism adjusts the amplitude of the middle presser foot of the middle presser cloth pressing mechanism based on the amplitude adjustment data of the middle presser foot stored in the storage mechanism when sewing is carried out based on the sewing pattern data.

The sewing machine according to the third aspect has the structure: the motion control mechanism adjusts the amplitude of the middle presser foot of the middle presser mechanism based on the middle presser foot amplitude adjustment data correlated with the sewing pattern data when sewing is carried out based on the sewing pattern data.

(effect of the invention)

In the first aspect of the invention, the sewing machine further includes a driving member for adjusting the height of the middle presser foot, which is different from a driving source for vertically moving the middle presser foot to press the sewing material downward, and the height of the bottom dead center is adjusted by adjusting the height of the middle presser foot before the middle presser foot reaches the bottom dead center position, for example.

Similarly, the operation control means drives the drive source for height adjustment, and drives the drive source for height adjustment to change the bottom dead center height or the top dead center height of the middle presser foot which moves up and down to press the workpiece as desired by driving the drive source for height adjustment before the middle presser foot reaches the bottom dead center or before the top dead center, thereby enabling amplitude adjustment.

Furthermore, the amplitude of the middle presser foot can be adjusted, so that the cloth can be pressed for the sewed articles with various thicknesses, and even if the thickness of the elastic sewed articles is changed in sewing due to the restoring force, the sewed articles can be effectively pressed by adjusting the amplitude to be proper.

Further, since the drive source for height adjustment is provided independently, the height adjustment and amplitude adjustment of the center presser can be performed even during sewing.

Therefore, the adaptability to various sewed articles can be improved by the aid of the method.

According to the invention described in the second aspect, the sewing machine operates the needle and the cloth holding portion based on the sewing pattern data stored in the storage means, and when stitches corresponding to a plurality of stitch data are formed, the height of the middle presser foot of the middle presser mechanism can be adjusted based on the middle presser foot height data stored as a part of the sewing pattern data together with the stitch data.

That is, the amplitude of the middle presser foot can be adjusted at a desired timing by combining the middle presser foot amplitude adjustment data for adjusting the amplitude of the middle presser foot of the middle presser mechanism in advance with the sewing pattern data and performing sewing based on the sewing pattern data by the sewing machine, the middle presser foot amplitude adjustment data functioning as a command of the sewing pattern data for performing sewing and being capable of adjusting the amplitude of the middle presser foot.

Thus, even for a sewn article whose thickness or stretchability changes, the amplitude can be adjusted in accordance with the change position at each part of the sewn article, and the adaptability to various sewn articles can be further improved.

According to the invention described in the third aspect, the sewing machine operates the needle and the cloth holding portion based on the sewing pattern data stored in the storage means, and when stitches corresponding to a plurality of stitch data are formed, the amplitude of the center presser foot of the center presser mechanism can be adjusted based on the center presser foot amplitude adjustment data stored in the storage means in accordance with the sewing pattern data.

That is, the amplitude of the middle presser foot is adjusted by combining the amplitude adjustment data of the middle presser foot in advance in accordance with the sewing pattern data and storing the data in the storage means, and the sewing is performed by the sewing machine based on the sewing pattern data, and the amplitude adjustment data of the middle presser foot functions as a command for performing the sewing, so that the sewing can be performed efficiently without setting an appropriate amplitude of the middle presser foot in accordance with the sewing pattern data.

Drawings

Fig. 1 is a perspective view showing a sewing machine of the present invention.

Fig. 2 is an enlarged perspective view showing the vicinity of the holding frame and the middle presser foot of the sewing machine of the present invention.

Fig. 3 is a side view before adjusting the height of the middle presser foot of the middle presser mechanism.

Fig. 4 is an exploded perspective view of the middle cloth pressing mechanism.

Fig. 5 is another exploded perspective view of the middle cloth pressing mechanism.

Fig. 6 is a side view for explaining the retracting mechanism (before retracting) of the middle presser foot.

Fig. 7 is a side view for explaining the retracting mechanism (during retracting) of the middle presser foot.

Fig. 8 is a side view for explaining the retracting mechanism (after retracting) of the middle presser foot.

Fig. 9 is a side view after adjusting the height of the middle presser foot of the middle presser mechanism.

Fig. 10 is a plan view showing an operation panel of the sewing machine.

Fig. 11 is an explanatory diagram showing sewing pattern data of the sewing machine.

Fig. 12 is an explanatory diagram showing needle movement (stitch shape) based on sewing pattern data.

Fig. 13 is an explanatory diagram showing program pattern data of the sewing machine.

Fig. 14 is a block diagram showing a control device of the sewing machine.

Fig. 15 is a flowchart showing the overall operation of the setting input operation of the sewing machine including the present invention.

Fig. 16 is a flowchart showing the overall operation of the sewing machine connected to fig. 15.

Fig. 17 is an explanatory diagram showing the driving timing of the middle presser motor for one rotation of the spindle motor.

Fig. 18 is a diagram showing a moving trajectory of the middle presser when the height of the middle presser is adjusted.

Fig. 19 is an explanatory diagram showing a driving pulse output timing chart of the middle presser motor for each rotation angle of the spindle motor for performing the middle presser amplitude adjustment operation.

Fig. 20 is a flowchart showing the entire sewing operation process shown in fig. 15.

Fig. 21 is a flowchart showing an insertion process performed in accordance with the rotation angle of the spindle motor in the sewing operation process.

Fig. 22 is a flowchart showing another insertion process performed in accordance with the rotation angle of the spindle motor in the sewing operation process.

In the figure: 1-middle presser mechanism, 2-spindle, 2 a-spindle motor, 29-middle presser foot, 34-guide member, 42-middle presser foot motor (drive member), 70-ROM, 71-RAM, 72-EEPROM (storage mechanism, middle presser foot height storage mechanism), 73-CPU, 100-electronic circulation sewing machine (sewing machine), 108-needle, 111-holding frame (cloth holding mechanism), 1000-control device (action control mechanism)

Detailed Description

(integral Structure of electronic circulation Sewing machine)

An embodiment of the present invention will be described with reference to fig. 1 to 22.

In the present embodiment, an electronic circulation sewing machine will be described as an example of the sewing machine. The electronic circulation sewing machine is a sewing machine: the sewing machine has a holding frame as a cloth holding part for holding a cloth of a sewed object to be sewed, and stitches based on predetermined sewing data (stitch pattern) are formed on the cloth held by the holding frame by relatively moving the holding frame to a needle.

Here, a direction in which the needle 108 moves up and down, which will be described later, is defined as a Z-axis direction (up-down direction), one direction orthogonal thereto is defined as an X-axis direction (left-right direction), and a direction orthogonal to both the Z-axis direction and the X-axis direction is defined as a Y-axis direction (front-back direction).

The electronic circulation sewing machine 100 (hereinafter, referred to as a sewing machine 100) is configured by, as shown in fig. 1, a sewing machine main body 101 disposed on an upper surface of a sewing machine table T, a foot board R disposed below the sewing machine table T for operating the sewing machine main body 101, and the like.

(Sewing machine frame and main shaft)

As shown in fig. 1, the sewing machine body 101 has a sewing machine frame 102 having an approximately コ -shaped outer shape when viewed from the side. The sewing machine frame 102 includes: a sewing machine head part 102a forming the upper part of the sewing machine body 101 and extending along the front and back direction, a sewing machine bottom plate part 102b forming the lower part of the sewing machine body 101 and extending along the front and back direction, and a vertical machine body part 102c connecting the sewing machine head part 102a and the sewing machine bottom plate part 102 b.

The sewing machine body 101 is provided with a power transmission mechanism in a sewing machine frame 102, and has a main shaft 2 (see fig. 4) which is rotatable and extends in the front-rear direction and a lower shaft not shown in the figure. The main shaft 2 is disposed inside the head section 102a of the sewing machine, and the lower shaft (not shown) is disposed inside the bottom plate section 102b of the sewing machine.

The spindle 2 is connected to a spindle motor 2a (see fig. 14), and a rotational force is applied from the spindle motor 2 a. The lower shaft (not shown) is coupled to the main shaft 2 via a vertical shaft (not shown), and when the main shaft 2 rotates, the power of the main shaft 2 is transmitted to the lower shaft side via the vertical shaft (not shown), and the lower shaft rotates.

A needle bar 108a that moves up and down in the Z-axis direction by the rotation of the main shaft 2 is connected to the tip of the main shaft 2, and a needle 108 is provided at the lower end of the needle bar 108a as shown in fig. 2. The needle up-down operation mechanism is constituted by the spindle 2, the spindle motor 2a, the needle bar 108a, and a transmission mechanism not shown in the figure that gives a driving force for moving the needle bar 108a up and down from the spindle 2.

Further, an encoder 2b (see fig. 14) is provided on a drive output shaft of the spindle motor 2a or the spindle. The encoder 2b detects a rotation angle of the main shaft motor 2a, for example, outputs a pulse signal to the control device 1000 every 1 ° of rotation of the main shaft motor 2 a. Further, the needle bar 108a performs a reciprocating motion as the main shaft 2 rotates once.

A rotating shuttle (not shown) is provided at the tip of the lower shaft (not shown). When the lower shaft rotates together with the main shaft 2, stitches are formed by the cooperative operation of the needle 108 and a rotary hook (not shown).

Further, since the connection structure of the spindle motor 2a, the spindle 2, the needle bar 108a, the needle 108, the lower shaft (not shown), the rotary hook (not shown), and the like is the same as the conventional one, the description thereof is omitted.

As shown in fig. 1 and 2, a needle plate 110 is disposed on the bottom plate portion 102b of the sewing machine, and a holding frame 111 and a needle 108 are disposed above the needle plate 110.

The holding frame 111 constituting the cloth holding mechanism is attached to an attachment member 113 provided at the front end of the head portion 102a of the sewing machine, and the X-axis motor 76a and the Y-axis motor 77a disposed in the bottom plate portion 102b of the sewing machine as the driving mechanism are connected to the attachment member 113 (see fig. 14).

The holding frame 111 holds the cloth as the object to be sewn, and moves the held cloth in the front-rear left-right direction together with the holding frame 111 in accordance with the driving of the X-axis motor 76a and the Y-axis motor 77 a. By the movement of the holding frame 111 being interlocked with the movement of the needle 108 or the rotary hook (not shown), stitches of stitch data based on predetermined sewing pattern data are formed on the fabric.

The holding frame 111 is composed of a presser foot (not shown) and a lower plate (not shown), and the mounting member 113 can be driven up and down by driving a presser foot motor 79b disposed in the sewing machine head 102a, and held by sandwiching cloth between the lower plate and the presser foot when the presser foot is lowered.

The holding frame 111, the mounting member 113, the X-axis motor 76a, and the Y-axis motor 77a function as a mechanism for positioning the needle and the cloth relative to each other in the X-axis direction and the Y-axis direction.

The foot pedal R drives the sewing machine 100, and operates as an operation foot pedal for moving the needle bar 108a (needle 108) up and down or for moving the holding frame 111. That is, a sensor (stepping amount detecting means) made of, for example, a variable resistor or the like for detecting the stepping operation position of the stepping-on operation of the.

(Medium-pressure cloth mechanism)

Further, a middle presser mechanism 1 (see fig. 3) is provided, and the middle presser mechanism 1 has a middle presser foot 29, and the middle presser foot 29 is constantly subjected to an elastic force applied downward by a coil spring 30 described later, and vertically moves in conjunction with the needle bar 108a, that is, the needle 108, and presses the material to be sewn downward in the vicinity of the needle while contacting the material to be sewn. The cloth pressing mechanism 1 is provided inside the head 102a of the sewing machine, and a needle 108 is inserted through a through hole formed on the front end side of the center presser 29.

As shown in fig. 3 to 5, the middle cloth pressing mechanism 1 is provided on a main shaft 2 that drives a needle bar 108a having a needle 108 provided at the tip thereof in the vertical direction. An eccentric cam 3 is fixed to the main shaft 2, and a connecting slip ring 4 is connected to the eccentric cam 3. A swing shaft boss 5 is connected to the connecting slip ring 4, and one end of a swing shaft 6 is connected to the swing shaft boss 5.

As shown in fig. 3 to 5, a base end portion of the middle presser adjustment handle 7 for adjusting the movement amount of the middle presser in the vertical direction D1 is fixed to the other end portion of the swing shaft 6. A grooved cam 7a is formed on the middle presser foot adjustment handle 7. The slot cam 7a is an arc-shaped long hole, and a desired position of the slot cam 7a and one end portion of the first link 8 are fixed to each other by an adjustment nut 9 and a segment screw 10 so as to be rotatable. The fixing position is formed between a position intersecting with the axis of the swing shaft 6 and a predetermined position on one end side of the center presser adjusting lever 7 away from the intersecting position, and the desired adjustment can be performed within the range.

The other end of the first link 8 is connected to the length of the second link 11 with a segmented screw 12 in a freely rotatable manner. When the middle presser 29 is positioned at the bottom dead center of the vertical reciprocating motion, the groove cam 7a engaged with the adjusting nut 9 forms a part of an arc centered on the axial center of the stepped screw 12. A positioning link 13 is connected to the rear surface side of the second link 11.

The positioning link 13 is rotatably attached to a sewing machine frame 102 as a sewing machine frame body near the center portion thereof by a set screw 14, and the position of the set screw 14 coincides with the position of the set screw 12 when the middle presser 29 is at the bottom dead center.

A spring hook 13a is formed at one end of the positioning link 13, a spring hook 15a is fixed to the sewing machine frame 102, a coil spring 16 is bridged between the two spring hooks, and the coil spring 16 applies a spring force that pulls the spring hook 13a downward to the one end of the mounted positioning link 13. That is, when the connecting point P1 between the second link 11 and the third link 20, which is the center presser swing portion, moves upward, the coil spring 16 functions as a pressing mechanism that presses the connecting point P1 downward. A stopper 17 is connected to the other end of the positioning link 13, and one end of the second link 11 and the other end of the positioning link 13 are connected by a single segmented screw 18. The stopper 17 is rotatably attached to the sewing machine frame 102 together with the positioning link 13 by a set screw 14. A restricting member 19 is provided above the one end portion 17a of the stopper portion 17 to restrict the stopper portion 17 from rotating upward. Further, a part of the sewing machine frame 102 may be used instead of the regulating member 19. The center presser swing mechanism M1 is configured by the first link 8, the second link 11, and the positioning link 13.

One end of a third link 20 is rotatably connected to the other end of the second link 11 by a segment screw 21. One end of a fourth link 22 is rotatably connected to the other end of the third link 20 by a segmented screw 23 so as to be aligned in a line in the longitudinal direction of the third link 20. The third link 20 and the fourth link 22 constitute a middle presser link member 24.

A link relay plate 25 is coupled to the other end of the fourth link 22 by a segment screw 26. A center strut abutment 27 is fixed to the link relay plate 25, and a center strut 28 extending in the vertical direction is held by the center strut abutment 27. A center presser foot 29 for pressing the cloth against the needle plate at the time of sewing is attached to the lower end portion of the center presser bar 28. A coil spring 30 is provided at the upper end of the center presser 28, and the coil spring 30 is attached to the center presser abutment 27 by a bolt 31 and a nut 32.

The segment screw 23 connects the corner block 33 and the guide member 34, and the third link 20 and the fourth link 22. That is, a guide member 34 is provided on the front side of the fourth link 22, a corner block 33 is provided on the front side of the guide member 34, and the third link 20, the fourth link 22, the corner block 33, and the guide member 34 are coupled by one split screw 23.

The corner block 33 functions as a spacer for filling up a gap between the segment screw 23 and the connection portion P3 between the third link 20 and the fourth link 22, and prevents the links from wobbling, thereby smoothly driving the respective members.

The guide member 34 is a substantially triangular plate material, and an upper end portion 34t thereof is rotatably attached to the sewing machine frame 102 by a segmented screw 35. A long hole 34a having a long dimension in the vertical direction is formed near the lower end of the guide member 34. The elongated hole 34a is formed to have a width slightly larger than the diameter of the threaded portion of the segment screw 23, and the segment screw 23 is inserted into the elongated hole 34 a. That is, the guide member 34 can move the connecting portion P3 between the third link 20 and the fourth link 22 in the vertical direction D1 of the center presser 29 and restrict the movement thereof in the direction D3 crossing the straight line direction D2 of the third link 20 and the fourth link 22.

Further, one end portion of a moving link 36 as a moving mechanism is rotatably coupled to the guide member 34 near an upper portion of the elongated hole 34a by a set screw 37, and the moving link 36 serves as a moving mechanism for moving the guide member 34 in a direction crossing the straight line direction of the third link 20 and the fourth link 22. An eccentric cam 38 is coupled to the other end of the moving link 36, and one end of a variable shaft 39 is coupled to the eccentric cam 38. A center presser motor 42 as a driving mechanism is connected to the other end of the variable shaft 39 through a bearing 40 and a bevel gear 41. That is, the drive of the middle presser motor 42 is transmitted in order of the variable shaft 39, the eccentric cam 38, and the moving link 36 moves the guide member 34.

The middle presser motor 42, the guide member 34, and the respective structures for transmitting power therebetween function as a middle presser height adjusting mechanism for adjusting the height of the middle presser 29, using the middle presser motor 42 (driving member) as a driving source.

The bevel gear 41 meshes with the bevel gear 43, so that the drive of the center presser motor 42 can be output in a direction D5 orthogonal to the axial direction of the variable shaft 39. A bearing 44, a center presser lifting cam 45, and the like are coaxially connected to the rear end of the bevel gear 43.

As shown in fig. 6 to 8, the center presser lifting cam 45 has one side formed in a substantially circular arc shape with a center line passing through the center of rotation as a boundary (hereinafter referred to as a maintaining portion 45 a), and the other side formed in a smoothly changing shape with a distance from the center of rotation to the outer peripheral surface larger than a distance from the center of rotation to the outer peripheral surface of the maintaining portion 45a (hereinafter referred to as a changing portion 45 b).

The middle presser lifting cam 45 is a member for lifting the middle presser lifting member 46, the middle presser lifting member 46 lifts the middle presser 29 to the retreat height position P5 after sewing is completed, and the outer peripheral surface of the middle presser lifting cam 45 is in contact with the outer peripheral surface of the cylindrical roller 47 provided at one end portion of the middle presser lifting member 46. That is, when the maintaining portion 45a of the middle presser foot lifting cam 45 is in contact with the roller 47, the middle presser foot lifting member 46 does not rise (see fig. 6), and when the changing portion 45b of the middle presser foot lifting cam 45 is in contact with the roller 47, the middle presser foot lifting member 46 rises (see fig. 7 and 8). That is, the middle presser foot retracting mechanism M2 is constituted by the middle presser foot lifting cam 45, the middle presser foot lifting member 46, and the roller 47.

The middle presser foot lift member 46, in which the belly portion is freely rotatably mounted on the sewing machine frame 102 by the pin 48. The middle presser lift member 46 is provided so that the other end thereof is positioned below the middle presser arch 27, and the other end of the middle presser lift member 46 is lifted by the contact of the changing portion 45b of the middle presser lift cam 45 with the roller 47, whereby the middle presser arch 27 is lifted and the middle presser 29 is lifted to the retreat height position P5 (see fig. 8). Further, a spring hook 49 is provided on the sewing machine frame 15, and is positioned above the middle presser foot lifting member 46, and one end of a coil spring 50 is provided on the spring hook 49, and the other end of the coil spring 50 is provided in the vicinity of one end of the middle presser foot lifting member 46. This causes the one end of the middle presser lifting member 46 to be constantly pressed upward.

Next, the operation of the intermediate cloth pressing mechanism 1 having the above-described structure will be described with reference to fig. 3 to 8.

When the spindle motor 2a is driven to rotate the spindle 2 or the eccentric cam 3, the tip of the connecting slip ring 4 swings in a direction substantially orthogonal to the axis of the spindle 2 (a direction D3 crossing the straight line direction D2 of the third link 20 and the fourth link 22), and the swing shaft boss 5 connected to the connecting slip ring 4 also swings in the same direction. Since the swing shaft 6 is also swung by the swinging of the swing shaft boss 5, the other end portion of the first link 8 swings in a direction substantially orthogonal to the axis of the swing shaft 6 (a direction D3 crossing the straight line direction D2 of the third link 20 and the fourth link 22) with the one end portion of the first link 8 serving as a swing fulcrum. As the other end of the first link 8 swings, the other end of the second link 11 swings in the straight line direction D2 between the third link 20 and the fourth link 22, and the third link 20 and the fourth link 22 connected to the other end of the second link 11 swing in the straight line direction (vertical direction) D2. As the third link 20 and the fourth link 22 swing, the middle presser bar 28 connected to the fourth link 22 moves downward along the vertical direction D1, and therefore the middle presser 29 also moves in the vertical direction.

Next, the operation of adjusting the center presser height position P4 of the center presser mechanism 1 having the above-described configuration will be described with reference to fig. 3 to 9.

The CPU73 of the control device 1000 described later executes a control program, and the middle presser motor 42 starts driving based on sewing pattern data or middle presser height data stored in the EEPROM72 described later.

The drive of the middle presser motor 42 is transmitted to the movable shaft 39 via the bevel gear 41 and the bearing 40, and the movable shaft 39 starts to rotate. By the rotation of the movable shaft 39, the eccentric cam 38 also rotates, and the movable link 36 swings in a direction substantially orthogonal to the axis of the movable shaft 39 (a direction D3 crossing the straight line direction D2 of the third link 20 and the fourth link 22). By the swinging of the moving link 36, the guide member 34 swings in a direction D3 that is transverse to the straight line direction D2 of the third link 20 and the fourth link 22.

At this time, as shown in fig. 9, since the screw portion of the segment screw 23 of the connecting portion P3 between the third link 20 and the fourth link 22, which is connected to the long hole 34a of the guide member 34, is restricted by the long hole 34a from moving in the direction D3 transverse to the straight line direction D2 between the third link 20 and the fourth link 22, the segment screw 23 moves upward along the long hole 34a at a position where the force transmitted by the swing is not released, and the angle formed by the third link 20 and the fourth link 22 connected in a row changes with the movement of the guide member 34 following the segment screw 23, and the center presser foot link member 24 is formed in a curved shape by the segment screw 23. At this time, the distance L between both end portions of the middle presser link member 24, in other words, the distance L between one end portion of the third link 20 and both end portions of the other end portion of the fourth link 22 becomes shorter, and the middle presser 29 moves upward along the vertical direction D1. Thereby, the middle presser height position P4 of the middle presser 29 from the needle plate can be adjusted.

(control System of Sewing machine: overview of the entirety)

As shown in fig. 1 and 10, the sewing machine 100 (sewing machine main body 101) includes an operation panel 74a for an operator to perform various setting operations on the sewing machine and input various data and the like. The operation panel 74a is connected to the sewing machine main body 101 through a wired or wireless line, not shown.

The operation panel 74a includes a plurality of operation groups for inputting various settings and various data for operating the sewing machine, a data display 74d for displaying various setting states, and the like.

As shown in fig. 10, the operation panel 74a is provided with: a data display unit 74d, a preparation key 74e, a reset key 74f, a +/forward key 74g, a-/backward key 74h, a pattern number key 74i, an X magnification/reduction ratio key 74j, a Y magnification/reduction ratio key 74k, a speed key 74l, a center presser height key 74m, a center presser amplitude correction key 74n, program keys ("Pr 1", "Pr 2", "Pr 3", "Pr 4") 74o, and LEDs 90, 91 indicating the operation state of the sewing machine or each key, and the like.

The data display unit 74d indicates various data numbers, data numerical values, and the like corresponding to the positions where the LED91 is lit and the keys.

The preparation key 74e is a key for performing an operation or the like for specifying data or numerical values to be changed, such as the +/forward key 74g and the-/reverse key 74 h.

The reset key 74f is a key for resetting the changed data or numerical value such as the +/forward key 74g and the-/reverse key 74 h.

The +/forward key 74g and the-/backward key 74h are keys for performing operations of changing various data numbers or data values (forward feed; +, reverse feed;).

The pattern number key 74i is a key for selecting desired sewing pattern data and calling the sewing pattern data corresponding to the sewing pattern data or indicating the sewing pattern No. when sewing is performed based on the preset and stored sewing pattern data, for example. The sewing pattern data will be described later.

The X magnification/reduction key 74j and the Y magnification/reduction key 74k are keys for setting and displaying magnification/reduction ratios for the X-axis component and the Y-axis component of a pattern when the pattern is sewn.

The speed key 74l is a key for setting and displaying the speed of the sewing machine when sewing.

The middle presser height key 74m is a key for setting and displaying the height of the middle presser 29 of the middle presser mechanism 1 at the time of sewing.

The middle presser amplitude correction key 74n is a key for setting input and display for correcting increase and decrease in the swing width of the middle presser 29 in the height direction of the middle presser mechanism 1 at the time of sewing.

The program keys ("Pr 1", "Pr 2", "Pr 3", and "Pr 4") 74o are keys for selecting data (program pattern data) for customized sewing, which are a combination of sewing pattern data, a magnification ratio, a sewing machine speed, a center presser height, and the like.

In the operation panel 74a, various data such as sewing data and program pattern data set and inputted by various keys are outputted to the control device 1000 described later and stored in the EEPROM72 described later.

(control System of Sewing machine: Sewing Pattern)

Here, the sewing pattern will be explained.

The sewing pattern is a needle movement pattern at the time of sewing, and is a pattern expressed by sewing pattern data configured by combining a plurality of data (stitch data indicating a needle drop position) of the X-direction movement amount and the Y-direction movement amount at the time of moving the holding frame 111 in order to implement the needle movement pattern. Fig. 11 and 12 show an example of actual sewing pattern data and stitch patterns. When the needle is moved from the origin position (0, 0) in accordance with the sewing pattern data of the pattern No.1 shown in fig. 11, the needle is moved as shown in fig. 12 to form stitches.

In the sewing pattern data shown in fig. 11, the empty feed 1, the empty feed 2, the empty feed 3 … sewing 16, and the sewing 17 are data (parameters) of the X-direction movement amount and the Y-direction movement amount when the holding frame 111 is moved. That is, the rotational driving amounts of the X-axis motor 76a and the Y-axis motor 77a at the time of sewing are determined from these data.

In the "air feed", only the holding frame 111 is moved without operating the needle bar 108a (needle 108), and in the "sewing", the holding frame 111 is operated together with the needle bar 108a (needle 108) to form stitches.

The "thread cutting" is a command for a thread cutting device (not shown), and the "end" is a command for the operation of the sewing machine 100, and since the numerical value setting for the operation is not necessary, the numerical value data (marked as (0) in fig. 11) is not set.

The "center presser height" and the "center presser amplitude correction amount" are commands for the operation of the center presser mechanism 1, and include numerical data for the operation.

That is, the height of the middle presser 29, that is, the rotational angle position of the middle presser motor 42 is determined by the set value of the "middle presser height" in the phase (180 °) of the bottom dead center of the needle 108 defined by the rotational angle of the spindle motor 2 a.

Further, the rotation driving amount of the middle presser motor 42 from the top dead center to the bottom dead center of the needle 108 and the rotation driving amount of the middle presser motor 42 from the bottom dead center to the top dead center in contrast are determined by the set value of the "middle presser amplitude correction amount".

Note that, in fig. 11 and 12, the numerical data of the X movement amount, the Y movement amount, the center presser movement amount, and the center presser amplitude correction amount are 10-fold marks, and "15" represents "1.5 mm", for example.

(control System of Sewing machine: program Pattern)

Next, the program pattern will be explained.

As shown in fig. 13, the program pattern data is obtained by selecting arbitrary sewing pattern data to be sewn, numerically setting an X magnification reduction ratio and a Y magnification reduction ratio for increasing and decreasing the X movement amount and the Y movement amount of each "empty feed cloth" and "sewing" command in the sewing pattern, numerically setting a sewing machine speed which is a rotation speed of the spindle motor 2a at the time of sewing, a bottom dead center height of the center presser foot 29 which is a reference in the sewing (in the case where the center presser foot height is set in the sewing pattern, the sewing pattern is prioritized), and numerically setting a correction amount of the vertical movement amplitude of the center presser foot 29 which is a reference in the sewing (in the case where the correction amount of the center presser foot amplitude is set in the sewing pattern, the sewing pattern is prioritized).

When the program pattern data is executed, the X movement amount and the Y movement amount are adjusted for the sewing pattern recorded in the selected program pattern, and sewing is executed by the set sewing machine speed, the middle presser foot height and the amplitude adjustment amount.

In the control device 1000 described later, four program pattern data can be stored in the EEPROM72, and the program keys ("Pr 1", "Pr 2", "Pr 3", and "Pr 4") 74o on the operation panel 74a can be called up individually.

(control System of Sewing machine: control device)

As shown in fig. 14, the sewing machine 100 is provided with a control device 1000 for controlling the operations of the above-described respective parts and components.

As shown in fig. 14, the control device 1000 includes a ROM70, a RAM71, an EEPROM72, and a CPU 73.

The ROM70(PROM) stores and stores a control program and control data relating to the sewing machine 100 (the sewing machine main body 101), and data relating to various kinds of sewing.

The RAM71 is provided with various work memories, counters, and the like, and is used as a work area during sewing operation or data processing, and temporarily stores programs, data, and the like read from the ROM70 or the EEPROM 72.

The EEPROM72 stores various data or various parameters inputted.

In particular, the EEPROM72 is a storage means for storing sewing pattern data (for example, sewing pattern data of pattern No.1 in fig. 11) or program patterns, which are obtained by combining a plurality of pieces of stitch data inputted through the operation panel 74 a.

The EEPROM72 stores data of the X magnification or the Y magnification, sewing machine speed data, center presser height data, center presser amplitude correction amount data, and the like. In particular, the EEPROM72 functions as a middle presser foot amplitude correction amount storage mechanism that stores middle presser foot amplitude correction amount data in accordance with sewing pattern data configured by combining a plurality of stitch data. The sewing pattern data may or may not include the center presser amplitude correction amount data.

In addition, the EEPROM72 stores: and program pattern data (for example, program pattern data "Pr 1", "Pr 2", "Pr 3" and "Pr 4" in fig. 13) which are combination of sewing pattern data, data of X magnification or Y magnification, sewing machine speed data, center presser height data, center presser amplitude correction amount data, and the like.

The CPU73 uses the RAM71 as an operation area (work area) and performs various operation processes, arithmetic processes, and the like based on a control program stored in the ROM 70.

The CPU73 of the control device 1000 functions as a middle presser foot amplitude correction amount adjustment control mechanism for adjusting the amplitude of the vertical movement of the middle presser foot 29 of the middle presser mechanism 1 based on the middle presser foot amplitude correction amount data stored in the EEPROM72 as a part of the sewing pattern data together with the plurality of stitch data.

The CPU73 of the control device 1000 functions as a middle presser amplitude correction amount adjustment control means for adjusting the amplitude amount of the vertical movement of the middle presser 29 of the middle presser mechanism 1 based on the middle presser amplitude correction amount data stored in the EEPROM72 as a storage means in association with the sewing pattern data.

The CPU73 as the amplitude correction amount adjustment control means controls the drive of the center presser motor 42 to adjust the amplitude of the vertical movement of the center presser 29 of the center presser mechanism 1.

The CPU73 is connected to the operation panel 74a through the interface 74, and selects and changes sewing pattern data based on data input from the operation panel 74 a.

The CPU73 is connected to the presser foot switch 74b and the start switch 74c via the interface 74, and performs a sewing process on each part of the sewing machine 100 based on the sewing pattern data and the like described above when an instruction signal is input from the presser foot switch 74b and the start switch 74 c.

The CPU73 is connected to a spindle motor drive circuit 75b that drives the spindle motor 2a via the interface 75, and controls the rotation of the spindle motor 2a to control the operation of drive mechanisms (e.g., the needle bar 108a on which the needle 108 is mounted, the spindle 2, and the like). The spindle motor 2a includes an encoder 2b, and a spindle motor drive circuit 75b that drives the spindle motor 2a inputs a Z-phase signal output from the encoder 2b every time the spindle motor 2a makes one rotation to the CPU73 through the interface 75, and the CPU73 recognizes the origin (0 ° position) of one rotation of the spindle 2 based on the Z-phase signal. The a-phase signal output from the encoder 2b is input to the CPU73 via the interface 75 for every 1 ° of the rotation angle of the spindle motor 2a, and the CPU73 can recognize the current rotation angle of the spindle 2 by counting the number of pulses of the a-phase signal with reference to the Z-phase signal.

Further, for the spindle motor 2a, for example, a servo motor may be used.

The CPU73 is connected to an X-axis motor drive circuit 76b and a Y-axis motor drive circuit 77b via an interface 76 and an interface 77, and the X-axis motor drive circuit 76b and the Y-axis motor drive circuit 77b drive an X-axis motor 76a and a Y-axis motor 77a of the holding frame 111 holding the cloth to be sewn, respectively, and control the movement of the holding frame 111 in the X-axis direction and the Y-axis direction.

The CPU73 is connected to a middle presser motor drive circuit 78b via an interface 78 to control the operation of the middle presser mechanism 1, and the middle presser motor drive circuit 78b drives a middle presser motor 42 for adjusting the height position of the middle presser 29, which is different from the vertical operation by the spindle motor 2 a.

The CPU73 is connected to a presser foot motor drive circuit 79b via an interface 79, and controls the operation of the presser foot, and the presser foot motor drive circuit 79b drives a presser foot motor 79a that moves the presser foot (not shown) up and down.

Further, for example, pulse motors can be used for the X-axis motor 76a, the Y-axis motor 77a, the middle presser motor 42, and the presser motor 79 a.

The CPU73 is connected to an X-axis origin sensor 80a and a Y-axis origin sensor 80b for detecting the origin position of the holding frame 111 via the interface 80, inputs a signal indicating whether or not the holding frame 111 is returned to the origin position, and performs control based on the signal.

The CPU73 is connected to a center presser origin sensor 80c for detecting the origin position of the center presser 29 of the center presser mechanism 1 via an interface 80, and inputs a signal indicating whether or not the center presser 29 of the center presser mechanism 1 is in a normal arrangement, and performs control based on the signal.

The CPU73 is connected to a cloth presser origin sensor 80d for detecting the origin position of a cloth presser (not shown) via an interface 80, and performs control based on a signal input thereto indicating whether or not the cloth presser is returned to the origin position.

(operation of the Sewing machine as a whole)

Next, the overall operation of the sewing machine 100 according to the present invention including various setting input operations will be described based on the flowcharts shown in fig. 15 and 16.

First, when a main power source (not shown) for operating the sewing machine 100 is activated and the control device 1000 detects a signal for pressing the program key ("Pr 1", "Pr 2", "Pr 3", or "Pr 4") 74o in a state where the sewing machine is activated (step S101; yes), the control device 1000 selects and reads out predetermined program pattern data corresponding to the pressed program key 74o from the program pattern data stored in the EEPROM72 and develops the program pattern data into the RAM71 for setting (step S102).

In addition, when the control device 1000 does not detect the signal of pressing the program key 74o (step S101; n) or after the setting of the program pattern of step S102, the process proceeds to step S103.

Next, when the control device 1000 detects a signal for pressing the pattern number key 74i, the X magnification/reduction ratio key 74j, the Y magnification/reduction ratio key 74k, the speed key 74l, the center presser height key 74m, and the center presser amplitude correction key 74n (step S103; Y), the control device 1000 displays the setting contents or the setting data corresponding to each key on the data display portion 74d and lights the corresponding LED91 (step S104).

Then, the controller 1000 proceeds to step S105 after the operation of step S104 or in the case where the pressing of the pattern number key 74i, the X magnification/reduction ratio key 74j, the Y magnification/reduction ratio key 74k, the speed key 74l, and the center presser height key 74m is not detected (step S103; n).

Next, when the control device 1000 detects a signal for pressing the +/forward key 74g or the/backward key 74h (step S105; yes), the control device 1000 updates the setting contents and the setting data displayed on the data display portion 74d (step S106).

Then, control device 1000 proceeds to step S107 in the case where the signal of pressing +/forward key 74g, -/backward key 74h is not detected (step S105; n), or after the update of the setting of step S106.

Next, control device 1000 monitors whether or not preparation key 74c has been operated, and if the signal indicating that preparation key 74c has been pressed is not detected (step S107; n), control device 1000 returns to step S101. On the other hand, when the control device 1000 detects a signal for pressing the preparation key 74c (step S107; y), the updated setting in step S106 is determined, and the process proceeds to step S108.

Next, the control device 1000 determines whether the data of the center presser height is changed (step S108).

If the control device 1000 determines that the data of the center presser height is changed (step S108; y), the control device 1000 writes the changed data of the new center presser height into the EEPROM72 (step S109). On the other hand, if the control device 1000 determines that the data of the presser foot height has not been changed (step S108; n), or after the data is written in step S109, the process proceeds to step S110.

Next, the control device 1000 determines whether the center presser amplitude correction amount data is changed (step S110).

When the control device 1000 determines that the center presser amplitude correction amount data is changed (step S110; yes), the control device 1000 writes the changed new center presser amplitude correction amount data to the EEPROM72 (step S111). On the other hand, if it is determined that the presser foot amplitude correction amount data has not been changed (step S110; n), or after the data is written in step S111, the control device 1000 proceeds to step S112.

Then, if the control device 1000 determines that the pattern No. or the X magnification/reduction ratio, the Y magnification/reduction ratio, the sewing machine speed, and the center presser height of the program selected and set in steps S102 to 104 have been changed (step S112; yes), the data of the new program pattern to be changed is written into the EEPROM72 (step S113), and the process proceeds to step S120. On the other hand, if control device 1000 determines that the program has not been changed (step S112; n), the process proceeds to step S120.

Next, the controller 1000 drives the presser motor 79a to perform origin detection for moving the presser (not shown) to the detection position of the presser origin sensor 80d (step S120). The origin position of the presser foot is a presser foot lowering position.

Then, the control device 1000 drives the center presser motor 42 to perform origin detection for moving the center presser to the detection position of the center presser origin sensor 80c (step S121). Furthermore, the original position of the middle presser foot is the ascending position of the middle presser foot.

Then, the control device 1000 drives the X-axis motor 76a and the Y-axis motor 77a to perform origin detection for moving the holding frame 111 to the detection positions of the X-axis origin sensor 80a and the Y-axis origin sensor 80b, and then moves the holding frame 111 to the sewing start position of the selected sewing pattern data (step S122).

Then, the controller 1000 drives the presser motor 79a to raise the presser (not shown) (step S123).

Next, the control device 1000 determines whether or not the presser foot SW74b is pressed (step S124).

If the signal for pressing presser SW74b is not detected (step S124; No), control device 1000 returns to step S124. On the other hand, when detecting a signal for pressing the presser SW74b (step S124; yes), the control device 1000 drives the presser motor 79a to lower the presser (not shown) (step S125).

Further, the control device 1000 determines whether or not the presser SW74b is pressed (step S126).

When detecting a signal for pressing the presser SW74b (step S126; y), the control device 1000 drives the presser motor 79a to raise the presser (not shown) (step S127), and returns to step S124. On the other hand, if the signal indicating that the presser foot SW74b is pressed is not detected (step S126; n), the control device 1000 proceeds to step S128.

Next, control device 1000 determines whether or not startup SW74c is pressed (step S128).

If the signal for pressing the start SW74c is not detected (step S128; n), the control device 1000 returns to step S126. On the other hand, when detecting the pressing of the signal to activate SW74c (step S128; yes), the control device 1000 performs a sewing operation process (step S129), and after the completion of the sewing operation process, the process proceeds to step S130.

Then, the control device 1000 drives the X-axis motor 76a and the Y-axis motor 77a to move the holding frame 11 from the sewing end position to the sewing start position (step S130).

Then, the control device 1000 drives the presser foot motor 79a to raise the presser foot (not shown) (step S131), and returns to step S124 to repeat the sewing operation.

(instruction of height adjustment of center presser foot of the present Sewing machine)

Next, the height adjustment process of the middle presser foot of the present sewing machine 100 will be described in detail.

Fig. 17 is an explanatory diagram showing the driving timing of the middle presser motor 42 when the spindle motor 2a rotates once (0 ° is the top dead center and 180 ° is the bottom dead center).

When the middle presser height data and the middle presser amplitude adjustment data are set, and when the middle presser height (bottom dead center height) is changed based on the middle presser height data included in the sewing pattern data, as shown in fig. 17, when the rotation angle of the spindle motor 2a is in the range R1 of 270 to 90 degrees [ ° ] (needle position), the middle presser motor 42 is driven so as to become [ the height indicated by the middle presser height data-the amplitude correction amount a indicated by the middle presser amplitude correction data ].

When the rotation angle of the spindle motor 2a is within a range of 135 to 180 [ ° ] R2, the middle presser motor 42 is driven so that the middle presser 29 is moved only upward or downward [ amplitude correction amount a indicated by middle presser amplitude correction data ].

When the rotation angle of the spindle motor 2a is in a range of 180 to 225 degrees [ ° ] R3, the center presser motor 42 is driven so that the center presser 29 is moved only downward or upward [ amplitude correction amount a indicated by center presser amplitude correction data ].

Fig. 18 is a diagram showing a movement trajectory of the middle presser 29 when adjusting the height of the middle presser. A trajectory L1 shown in fig. 18 indicates a trajectory when the bottom dead center is reached without amplitude correction and [ the height indicated by the center presser height data ], and a trajectory L2 indicates a trajectory when the bottom dead center is reached without amplitude correction and [ the height indicated by the center presser height data — the amplitude correction amount a indicated by the center presser amplitude correction data ].

The trajectory of L2 is thus controlled by the height that is not represented by the center presser height data, but by the following two controls: that is, the middle presser foot motor 42 controls the middle presser foot 29 to be lowered only by the same height as the amount of reduction a caused by the amplitude correction amount before passing through the bottom dead center position, and to be raised only by the same height as the amount of reduction a caused by the amplitude correction amount after passing through the bottom dead center position, and to return to the initial position; in this way, before and after the bottom dead center, the center presser 29 can trace the trajectory along the trajectory L3 and the height indicated by the center presser height data.

Further, the middle presser 29 traces a trajectory along the trajectory L2 except before and after the bottom dead center, and since the height of the top dead center passes through a position lower than L1 by the correction amount a, the amplitude of the entire middle presser 29 (the amplitude from the top dead center to the bottom dead center) can be increased by the amplitude correction amount a.

Fig. 19 shows a drive pulse output timing chart of the middle presser motor 42 for each rotation angle of the spindle motor 2a for performing the middle presser amplitude adjustment operation.

The control device 1000 stores an output table of drive pulses of the center presser motor 42 when the rotation angle of the spindle motor 2a is R2 and R3 in the PROM70, and if the amplitude correction amount a indicated by the center presser amplitude correction data is acquired, the CPU73 controls the drive of the center presser motor 42 in accordance with the output table.

For example, when the amplitude correction amount is set to 10 pulses (10 pulse amplitude is increased), since the spindle motor 2a is rotated in the range R2 of 135 to 180 °, the middle presser foot motor 42 must be rotated 10 pulses in the direction in which the middle presser foot 29 descends, and therefore a table is set so that the rotation angle of the spindle motor 2a is driven by 2 pulses substantially between 9 °.

In addition, in the range R3 of 180 to 225 °, the center presser motor 42 must be driven in pulses at 10 degrees in the direction in which the center presser 29 rises, and therefore, a table is set so that the rotation angle of the spindle motor 2a is driven in pulses at 2 degrees substantially between 9 °.

Further, the other amplitude correction amounts 9 to-10 pulses are also set so as to perform pulse driving at appropriate intervals.

In fig. 19, the rotation angle of the spindle motor 2a is not shown before and after 180 °.

(explanation of sewing operation processing of the present sewing machine)

Next, the sewing operation processing in step S129 will be described based on the flowcharts shown in fig. 20 to 22. Fig. 20 shows the entire sewing operation process, and fig. 21 and 22 show the insertion process performed in accordance with the rotation angle of the spindle motor 2a in the sewing operation process.

The sewing machine 100 performs sewing based on the sewing pattern data in the program pattern data selected in step S101 or the plurality of stitch data of the sewing pattern data selected in step S102.

First, the control device 1000 determines whether stitch data of the selected sewing pattern data is "empty cloth feeding" data (step S201).

If controller 1000 determines that the stitch data is "empty cloth feeding" data (step S201; yes), controller 1000 drives X-axis motor 76a and Y-axis motor 77a based on the X movement amount and Y movement amount of the "empty cloth feeding" data to move holding frame 111 (step S202). At this time, when the X magnification/reduction ratio or the Y magnification/reduction ratio is set, the motors 76a and 77a are driven based on the X movement amount and the Y movement amount multiplied by the set values, and the process returns to step S201.

Then, if the control device 1000 determines that the stitch data is not the "empty cloth feeding" data (step S201; n), the process proceeds to step S203.

Next, the control device 1000 determines whether the stitch data of the selected sewing pattern data is "end data (end command)" (step S203).

If the control device 1000 determines that the stitch data is "end data (end command)" (step S203; yes), the sewing operation processing (subroutine) is ended, and the routine returns to the main routine. On the other hand, if the control device 1000 determines that the stitch data is not "end data (end command)" (step S203; n), the process proceeds to step S204.

Next, the control device 1000 determines whether or not the selected sewing pattern data is selected as program pattern data (step S204).

When the control device 1000 determines that the sewing pattern data is selected as the program pattern data (step S204; y), the control device 1000 operates the middle presser motor 42 to lower the middle presser 29 to a predetermined height in accordance with the middle presser height data in the program pattern data (step S205), and the process proceeds to step S207.

On the other hand, if the control device 1000 determines that the sewing pattern data is not the data selected as the program pattern data (step S204; n), the control device 1000 operates the middle presser motor 42 to lower the middle presser 29 to a predetermined height in accordance with the middle presser height data in the sewing pattern data (step S206), and the process proceeds to step S207.

Next, the control device 1000 outputs a sewing machine speed command to the main shaft motor drive circuit 75b based on the set sewing machine speed, starts a sewing machine rotation command, rotates the main shaft 2 of the sewing machine 100, and operates the needle bar 108a (needle 108) (step S207).

Next, the control device 1000 determines whether the needle 108 is in the needle-down position (the rotation angle of the spindle motor 2a is in the range of 90 to 270 °) from the output of the encoder 2b (step S208).

If the control device 1000 determines that the needle 108 is not in the needle-off position (step S208; n), the process returns to step S208. On the other hand, if the control device 1000 determines that the needle 108 is in the needle-off position (step S208; yes), the process proceeds to step S209.

Next, the control device 1000 determines whether the stitch data of the selected sewing pattern data is "thread cutting data (thread cutting command)" (step S209).

If the control device 1000 determines that the stitch data is "thread cutting data (thread cutting command)" (step S209; yes), the process proceeds to step S214.

On the other hand, if the control device 1000 determines that the stitch data is not the "thread cutting data (thread cutting command)" (step S209; n), the process proceeds to step S210.

Next, the control device 1000 determines whether or not the timing is the driving timing of the X-axis motor 76a and the Y-axis motor 77a based on the output of the encoder 2b (step S210). The drive timing of the X-axis motor 76a and the Y-axis motor 77a is set to an arbitrary angle within a range of 90 to 135 ° in the rotation angle of the spindle motor 2a, and it is determined whether or not the angle is reached.

If it is determined that the timing of driving the motors 76a and 77a is not the same (step S210; n), the control device 1000 returns to step S210.

On the other hand, if the control device 1000 determines that the timing is the drive timing of each of the motors 76a and 77a (step S210; yes), the control device 1000 drives the X-axis motor 76a and the Y-axis motor 77a based on the X movement amount and the Y movement amount of the "sewing" data of the sewing pattern data to move the holding frame 111 (step S211). At this time, when the X magnification or the Y magnification is set, the motors 76a and 77a are driven based on the X movement amount and the Y movement amount multiplied by the set values.

Next, the control device 1000 determines whether the stitch data of the selected sewing pattern data is "middle presser height data (middle presser height command)" (step S212).

When the control device 1000 determines that the stitch data is "middle presser height data (middle presser height command)" (step S212; "yes"), the control device 1000 operates the middle presser motor 42 so that the presser height indicated by the middle presser height data becomes a height reduced by the current amplitude correction amount of the presser, lowers the middle presser 29 by a predetermined height to change the arrangement (step S213), and returns to step S208. On the other hand, if the control device 1000 determines that the stitch data is not the "middle presser height data (middle presser height command)" (step S212; "no"), the process returns to step S208.

In step S214, the controller 1000 outputs a thread cutting command to the thread cutting device (not shown) to cut a thread, and outputs a sewing machine stop command as a sewing machine rotation off command to wait until the needle 108 stops at the needle position (step S215).

When the control device 1000 determines that the main shaft 2 is stopped and the sewing machine 100 is stopped (step S215; yes), the control device 1000 activates the middle presser motor 42 to raise the middle presser 29 to the height of the origin to be disposed at the standby position (step S216), and the process returns to step S201.

As shown in fig. 21, when the control device 1000 detects the Z-phase signal from the encoder 2b while the sewing operation process is continued, the Z-phase insertion process is performed to update the needle bar position to 0 regardless of whether the sewing process is being performed. That is, the rotation angle of the spindle motor 2a is updated to 0 ° (step S301).

As shown in fig. 22, when the control device 1000 detects the phase a signal from the encoder 2b during the sewing operation, the phase a insertion process is performed regardless of whether the sewing process is being performed, and 1 is added to the count value of the needle bar position. That is, 1 ° (step S401) is added to the current rotation angle of the spindle motor 2 a.

Next, the control device 1000 determines whether or not the rotation angle of the spindle motor 2a obtained from the output of the encoder 2b is in the range of 135 to 225 ° (step S402).

When determining that the rotation angle of the spindle motor 2a is not in the range of 135 to 225 ° (step S402; n), the control device 1000 completes the a-phase insertion process.

On the other hand, when the control device 1000 determines that the rotation angle of the spindle motor 2a is within the range of 135 to 225 ° (step S402; yes), the process proceeds to step S403.

In step S403, the controller 1000 refers to the drive pulse output timing stored in the PROM70, reads the number of drive pulses from the current rotation angle of the spindle motor 2a and the amplitude correction amount indicated by the current center presser amplitude correction data, and develops the number of drive pulses in the RAM 71.

Then, the control device 1000 determines whether the read drive pulse number is 1 (step S404).

Then, if the read drive pulse number is 1 (step S404; yes), the controller 1000 drives the middle presser motor 42 in the downward direction by 1 pulse (step S405), and completes the phase a insertion process.

On the other hand, in the case where the read number of drive pulses is not 1 (step S404; n), the flow proceeds to step S406.

In step S406, the control device 1000 determines whether the read drive pulse number is-1.

Then, when the read drive pulse number is-1 (step S406; yes), the controller 1000 drives the middle presser motor 42 by 1 pulse in the upward direction (step S407), and the phase a insertion process is completed.

On the other hand, in the case where the read number of drive pulses is not-1 (step S406; n), the a-phase insertion process is completed.

(effect of electronic circulation Sewing machine)

As described above, the sewing machine 100 of the present invention, when sewing based on the sewing pattern data stored in the EEPROM72, is based on: the amplitude of the vertical direction of the middle presser foot 29 of the middle presser mechanism 1 can be adjusted and changed by controlling the operation of the middle presser foot motor 42 of the middle presser mechanism 1, by the middle presser foot amplitude adjustment data stored as a part of the sewing pattern data or the middle presser foot amplitude adjustment data stored in the program pattern data in correspondence with the sewing pattern data.

That is, by combining the middle presser amplitude adjustment data for adjusting the amplitude of the middle presser 29 of the middle presser mechanism 1 in advance with the sewing pattern data or the program pattern data, the middle presser amplitude adjustment data functions as a command of the sewing data for performing sewing when the sewing machine 100 performs sewing based on the sewing pattern data or the program pattern data, and the amplitude of the middle presser 29 can be adjusted at the middle presser mechanism 1 at a desired timing.

Thus, even when the thickness or the stretchability of each portion of the cloth changes, the amplitude can be adjusted in accordance with the change position, and the adaptability to various sewed materials can be improved.

In addition, in the program pattern data, when the middle presser foot amplitude adjustment data is stored corresponding to the sewing pattern data, the middle presser foot amplitude suitable for the sewing pattern can be set, so that the operation of setting the amplitude of the middle presser foot is not needed during sewing, and the sewing can be efficiently performed.

In the above embodiment, the EEPROM72 has been described as the storage means and the middle presser height storage means, but the present invention is not limited to this, and other storage devices (magnetic recording media, optical recording media, semiconductor memories, etc.) may be provided as the storage means.

Further, instead of the XY mechanism, a driving mechanism such as a single-axis driving or an arc driving may be used.

It is to be understood that other, specific details of the structure and the like may be appropriately modified.

Claims (3)

1. A sewing machine comprising:

a needle up-down movement mechanism for moving the needle up and down; and

a cloth holding mechanism which holds a sewn article and moves in a horizontal direction so as to be positioned with respect to the needle; and

a middle presser mechanism having a middle presser foot which is vertically movable in conjunction with the needle and presses the material to be sewn downward in the vicinity of the needle while contacting the material to be sewn; and

a middle presser foot height adjusting mechanism for adjusting the height of the middle presser foot of the middle cloth pressing mechanism; the method is characterized in that:

the middle presser height adjusting mechanism is provided with a driving component for adjusting the height of the middle presser,

and an operation control mechanism which controls the driving component and drives the middle presser foot to adjust the vertical movement amplitude of the middle presser foot when the middle presser foot ascends and descends respectively.

2. The sewing machine of claim 1, wherein:

further comprising a storage mechanism for storing sewing pattern data composed of stitch data and storing middle presser amplitude adjustment data related to amplitude adjustment of the middle presser as a part of the sewing pattern data together with the stitch data,

the action control mechanism adjusts the amplitude of the middle presser foot of the middle presser cloth pressing mechanism based on the amplitude adjustment data of the middle presser foot stored in the storage mechanism when sewing is carried out based on the sewing pattern data.

3. The sewing machine of claim 1, wherein:

the storage mechanism is provided for storing a plurality of sewing pattern data formed by stitch data and storing middle presser foot amplitude adjustment data related to the amplitude adjustment of the middle presser foot of the middle presser mechanism in association with the sewing pattern data,

the action control mechanism adjusts the amplitude of the middle presser foot of the middle presser cloth pressing mechanism based on the middle presser foot amplitude adjustment data correlated with the sewing pattern data when sewing is carried out based on the sewing pattern data.

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